Tachometer install

[t_furl43 78]

Hey guys, I’m wanting to put a tachometer on my 416-H I was wondering how to do so. TIA fellas 

[lynnmor 7,622]

4 hours ago, t_furl43 said:

Hey guys, I’m wanting to put a tachometer on my 416-H I was wondering how to do so. TIA fellas 

I guess that you have a 16 horsepower Onan engine.  If you can mount a 520H tachometer, simply run a wire from one of the outside terminals of the voltage regulator to the tachometer, and another wire from the tachometer to ground.  Tachometers can be found within other posts on the subject.  See wiring diagrams for 520H tractors for additional information.

[t_furl43 78]

1 hour ago, lynnmor said:

I guess that you have a 16 horsepower Onan engine.  If you can mount a 520H tachometer, simply run a wire from one of the outside terminals of the voltage regulator to the tachometer, and another wire from the tachometer to ground.  Tachometers can be found within other posts on the subject.  See wiring diagrams for 520H tractors for additional information.

yes it does have the 16hp Onan, thanks alot for the info ill have to look into getting one of those tachs 

[gwest_ca-(File Mod) 11,280]

The tach also requires battery power so get that from another gauge. A gauge ground also required.

The rpm signal is got from one of the AC stator leads

BUT

One of the AC leads is connected to the regulator DC+ output so that one will not work.

Use the other AC connection.

[t_furl43 78]

On 12/18/2021 at 11:02 PM, lynnmor said:

I guess that you have a 16 horsepower Onan engine.  If you can mount a 520H tachometer, simply run a wire from one of the outside terminals of the voltage regulator to the tachometer, and another wire from the tachometer to ground.  Tachometers can be found within other posts on the subject.  See wiring diagrams for 520H tractors for additional information.

Does it matter which one of the outside terminals I use?

[t_furl43 78]

On 12/19/2021 at 8:13 AM, gwest_ca said:

The tach also requires battery power so get that from another gauge. A gauge ground also required.

The rpm signal is got from one of the AC stator leads

BUT

One of the AC leads is connected to the regulator DC+ output so that one will not work.

Use the other AC connection.

Do you know off hand which one to use and which one to not?

[lynnmor 7,622]

45 minutes ago, t_furl43 said:

Do you know off hand which one to use and which one to not?

 

The center red one goes eventually to the battery, you piggyback on one of the other terminals.  Someone on here said that it does matter, but I can't see why.  Wheel Horse uses the one towards the rear.

[gwest_ca-(File Mod) 11,280]

Years ago I had a 3-wire large 15 amp regulator with one of the AC terminals rusted off. In the process of trying to repair the missing terminal I discovered that terminal was connected directly to the DC+ terminal inside the regulator. So I just joined the AC wire to the DC+ wire and it has worked to this day. Had the other AC terminal been missing this repair would not work.

Then I discovered Wheel Horse used a 2-wire 15 amp regulator in the early 1980's just like what I had done.

The AC lead that is connected to the DC+ terminal will not create a signal to drive the tach.

Many will remember SOI from years ago who was an electrical genius. He explained why and how that works but it was way over my head.

You can see the jumper in the 2-wire regulator harness that changes the 3-wire to 2-wire.

 

[t_furl43 78]

8 hours ago, lynnmor said:

 

The center red one goes eventually to the battery, you piggyback on one of the other terminals.  Someone on here said that it does matter, but I can't see why.  Wheel Horse uses the one towards the rear.

 

6 hours ago, gwest_ca said:

Years ago I had a 3-wire large 15 amp regulator with one of the AC terminals rusted off. In the process of trying to repair the missing terminal I discovered that terminal was connected directly to the DC+ terminal inside the regulator. So I just joined the AC wire to the DC+ wire and it has worked to this day. Had the other AC terminal been missing this repair would not work.

Then I discovered Wheel Horse used a 2-wire 15 amp regulator in the early 1980's just like what I had done.

The AC lead that is connected to the DC+ terminal will not create a signal to drive the tach.

Many will remember SOI from years ago who was an electrical genius. He explained why and how that works but it was way over my head.

You can see the jumper in the 2-wire regulator harness that changes the 3-wire to 2-wire.

 

thanks to both of you guys youve been more than helpful, i very much appreciate the info and merry Christmas to you both 

[lynnmor 7,622]

Merry Christmas to you. 

 

If all else fails, I am straight across the river.